Yeah, all that stuff you said has been on the English Wiki all year, YellowYoshi :V
Yukari's spell really isn't worth using still yeah. Chen isn't going to be in the front lines much when Yukari can move and with Ran also there, and Yukari is much better off going with DEF or MND levelups instead of MAG. Now, if you DID have a MAG-based Yukari, it'd be about as strong as Saigyouji Flawless Nirvana, when both Chen and Ran are in the active party. But that's just so situational, and Yukari's survivability would be a good bit worse for wear... she's best to just tank and use supporting skills, which she's pretty good at.